Heat-conducting tube and method of making the same



Nov. 30, 1926. 1,608,905

J. B. MURRAY ET AL HEAT CONDUCTING TUBE AND METHOD OF MAKING THE SAMEFiled June 18, 192

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Patented Nov. V30, 1926.

\ U ED" STATES P NT JOSEPH B. MURRAY AND THOMAS E. MURRAY; JR. OFBROOKLYN. YORK.

HEAT-CONDUCTING TUBE AND METHOD or MAKING THE shivinl' Application filedJune 1 8,

In certain prior applications, Nos. 642,- 427 filed May 31, 1923, and642,725 filed June 1, 1923, there is described a certain hollowconstruction for walls and other parts of boilers or heaters and made upof tubes of reztangular, circular or irregular crosssection with fins orflanges extending lengthwise thereof so as to provide a heating surfaceexposed to the heating gases greater than the surface which is incontact with the water or other fluid in the tube.

The presentinvention provides a unit and a method of producing the samefrom which such boiler walls and the like may be built. The accompan ingdrawings illustrate embodiments of t e lnvention.

Fig. 1 is a horizontal section of a side wall of a boiler built with thetubular units of the invention;

Figs. 2 to 5 are plans of various forms of units made in accordance withthe invention. a

In an application co-pending herewith, Serial No. 715,369, filed May 23,1924, there are described special forms of units and methods ofproduction thereof. The present application covers specifically distinctconstructions for such units.

According to Fig; 1, an inner wall or screen for a boiler is made oftubes 1 each of which has at one side a lateral flange 2 extending tothe next tube and approximat'ely closing the space between the twotubes, while leaving freedom for relative movement under the distortionproduced by heat. Back of the screen thus described is an ordinaryboiler wall made of refractory bricks 3, insulating tiles 4 and a shell5 of sheet steel.

The present application is directed to the production of units for thebuilding of such a wall in which the flanges on the tubes are integralwith the walls of the tubes 1. This result is obtained in Fig.2 bybending a sheet, leaving a portion '2 flat to form the flangeand bendingthe remainder around to form a tube 1 with its free edge abutting thepart 2 at its inner edge,.and arc welding the edges together by means ofdeposited metal 6, or butt welding them, or uniting them by both means.I

Fig. 3 is similar to Fig. 2 except that the free edge of the tube 1 isflanged and lapped 1924. Serial N0. 720,737.

over the inner edge of the part 2, as at g; the parts being weldedtogether as beore.

There are advantages in providing two flanges on each tube, one ateither side, since a given space between adjacent tubes can be coveredwith flanges of less width, which provide shorter paths for transmissionof the heat to the tubes. For obtainin two integral flanges thearrangementof Fig. 4 is suitable. Here the unit is made of two identicalpiezes each with a flat flange portion 8 ant a substantiallysemi-circular portion 9; the edges of the parts 9 being butted againstthe inner edges of the parts 8 as shown and welded as in the previouscases. Generally speaking it appears preferable that each tube with itsflange or flanges shall constitute a separate unit. But there are casesin which it may be desirable to make up one complete unit of two or moretubes. Fig. 5 illustrates a construction of this sort. The unit is madeof two pieces of sheet metal each comprising an outer flange 10 with anadjacent semi-circular portion 11, an intermediate web or flange 12 anda second semi-circularportion 13, these parts being brought together'soas to form two parallel tubes with an intermediate web and with flanges10 at the sides and being welded together as at 6 and preferably s 0twelded as at 14 to prevent separation o the parts 12 under the pressurewithin the tubes. Units of this sort will be placed alongside of oneanother, as indicated at the left of the H figure, with the respectiveflanges 10 over lapping.

Though we have described with great particularity of detail certainembodiments of our invention, yet it is not be be understood therefromthat the invention is restricted to the particular embodimentsdisclosed. Various modifications ma be made by those skilled in the artwit out do arture from of which: constitutes the flange portion ofsection throughout its "length, and welding 10 the unit and anotherportion of thewidth the bent around edge in a continuous lengthof whichsheet is bent to form the tube; wise joint leaving the remaining"portion I 2. The method of making a tubular heat of the width of thesheetv as an integral 5 conducting unit for boilers and similar agflangeextending lengthwise of the tube.

arat'us which consists in forming a, tu e )y bendin around a portion ofthe width of signed our names. a sheet w ich is continuous throughoutits JOSEPH B. MURRAY. length so as to form a tube of closed cross- W v vTHOMAS E. MURRAY, JR,

In witness whereof, we have hereu'ntoill

